[PATCH 6/6] arm64: dts: imx91-9x9-qsb: Add PDM microphone sound card support

[chancel.liu at oss.nxp.com]

From: Chancel Liu <chancel.liu at nxp.com>

Add PDM microphone sound card support, configure the pinmux.

This sound card supports recording sound from PDM microphone and
convert the PDM format data to PCM data.

Signed-off-by: Chancel Liu <chancel.liu at nxp.com>
---
 .../boot/dts/freescale/imx91-9x9-qsb.dts      | 44 +++++++++++++++++++
 1 file changed, 44 insertions(+)

diff --git a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
index c5b9dfee95eb..22114166df8c 100644
--- a/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
+++ b/arch/arm64/boot/dts/freescale/imx91-9x9-qsb.dts
@@ -79,6 +79,18 @@ sai1_enable: sai1-enable-grp {
 		};
 	};
 
+	dmic: dmic {
+		compatible = "dmic-codec";
+		#sound-dai-cells = <0>;
+		num-channels = <4>;
+
+		port {
+			dmic_ep: endpoint {
+				remote-endpoint = <&micfil_ep>;
+			};
+		};
+	};
+
 	reg_vref_1v8: regulator-adc-vref {
 		compatible = "regulator-fixed";
 		regulator-name = "vref_1v8";
@@ -111,6 +123,12 @@ linux,cma {
 		};
 	};
 
+	sound-micfil {
+		compatible = "audio-graph-card2";
+		label = "micfil-audio";
+		links = <&micfil_port>;
+	};
+
 	sound-wm8524 {
 		compatible = "audio-graph-card2";
 		label = "wm8524-audio";
@@ -202,6 +220,14 @@ MX91_PAD_CCM_CLKO1__GPIO3_IO26                          0x31e
 		>;
 	};
 
+	pinctrl_pdm: pdmgrp {
+		fsl,pins = <
+			MX91_PAD_PDM_CLK__PDM_CLK				0x31e
+			MX91_PAD_PDM_BIT_STREAM0__PDM_BIT_STREAM0		0x31e
+			MX91_PAD_PDM_BIT_STREAM1__PDM_BIT_STREAM1		0x31e
+		>;
+	};
+
 	pinctrl_reg_usdhc2_vmmc: regusdhc2vmmcgrp {
 		fsl,pins = <
 			MX91_PAD_SD2_RESET_B__GPIO3_IO7                         0x31e
@@ -464,6 +490,24 @@ &lpuart1 {
 	status = "okay";
 };
 
+&micfil {
+	#sound-dai-cells = <0>;
+	pinctrl-names = "default";
+	pinctrl-0 = <&pinctrl_pdm>, <&pdm_fun>;
+	assigned-clocks = <&clk IMX93_CLK_PDM>;
+	assigned-clock-parents = <&clk IMX93_CLK_AUDIO_PLL>;
+	assigned-clock-rates = <49152000>;
+	status = "okay";
+
+	micfil_port: port {
+		capture-only;
+
+		micfil_ep: endpoint {
+			remote-endpoint = <&dmic_ep>;
+		};
+	};
+};
+
 &sai1 {
 	#sound-dai-cells = <0>;
 	pinctrl-names = "default";
-- 
2.50.1